Diamond-Blackfan Anemia (DBA)

What happens in DBA

Most people with DBA have a variant in one of more than 20 genes that make ribosomal proteins, the parts of the cell's protein-building machinery. Red blood cell precursors in the bone marrow are especially sensitive to ribosome problems, so they die early. The result is a low red blood cell count with few young red cells (reticulocytes), while other blood lines are largely spared. DBA is therefore called a ribosomopathy.

• RPS19 is the most commonly affected gene, in about a quarter of patients.
• Inheritance is usually autosomal dominant, but many cases are new (de novo) variants.
• Rare forms involve the GATA1 gene and are X-linked.
• Family members with the same variant can be affected very differently, from severe anemia to almost none.

DBA affects roughly 5 to 7 per million live births.

Symptoms

Anemia

• pale skin
• poor feeding and slow weight gain
• tiredness, irritability and sleepiness
• fast heartbeat and breathing
• heart murmur

Physical differences (in about half of patients)

• craniofacial: wide-set eyes, flat nasal bridge, small jaw, cleft lip or palate
• thumbs and hands: triphalangeal thumb (three bones), flat or missing thumb
• heart and kidney anomalies
• short stature and low birth weight
• genital anomalies

Diagnosis

• Complete blood count: anemia with large red cells (macrocytosis) and very low reticulocyte count. White cells and platelets are usually normal.
• Bone marrow examination: few or no red blood cell precursors, with other cell lines normal.
• Erythrocyte adenosine deaminase (eADA): often raised.
• Fetal hemoglobin: often raised.
• Genetic testing for ribosomal protein genes. Identifying the variant helps screen family members and guides donor selection for transplant.
• Excluding other causes: such as transient erythroblastopenia of childhood, parvovirus infection and other bone marrow failure syndromes like Fanconi anemia.

Treatment

Corticosteroids

Most children respond to steroids at first. Treatment is usually started after the first year of life, when growth and development are less affected by steroids, with transfusions used before that. The goal is the lowest dose that maintains a safe hemoglobin. Long-term side effects include poor growth, weight gain, bone thinning, high blood pressure and cataracts.

Chronic red blood cell transfusions

For children who do not respond to steroids or need doses that are too high, transfusions are given every 3 to 5 weeks. Repeated transfusions lead to iron overload, which can damage the heart, liver and hormone glands, so iron chelation therapy is required, along with monitoring by MRI and blood tests.

Stem cell transplant

A hematopoietic stem cell transplant from a matched donor is the only cure for the blood problem. It is most successful in younger children with a matched sibling donor who does not carry the DBA variant. It does not remove the physical anomalies or completely eliminate cancer risk.

Remission

About 1 in 5 patients go into remission, with stable hemoglobin without treatment, sometimes for years. Remission can be lost later.

Complications

• iron overload from transfusions
• steroid side effects
• infections
• increased risk of myelodysplastic syndrome, acute myeloid leukemia, colorectal cancer and osteosarcoma, often at younger ages than usual
• pregnancy complications in women with DBA

Living with DBA

Care is coordinated by a pediatric hematologist and later an adult hematologist experienced in inherited bone marrow failure. Recommended monitoring includes regular blood counts, iron studies, growth and puberty checks, bone density, and cancer surveillance such as earlier colonoscopy screening. Genetic counseling is offered to families.

Frequently asked questions

What is Diamond-Blackfan anemia?

Diamond-Blackfan anemia is a rare inherited bone marrow failure syndrome in which the marrow does not make enough red blood cells. It usually appears in the first year of life with severe anemia. Many children also have physical differences such as thumb anomalies, cleft palate or short stature.

What causes Diamond-Blackfan anemia?

It is usually caused by a variant in a gene that makes a ribosomal protein, most often RPS19. Red blood cell precursors are especially sensitive to the resulting ribosome defect. The variant may be inherited from a parent or arise new in the child.

How is Diamond-Blackfan anemia treated?

Most children are first treated with steroids, which raise red cell production in many. Those who do not respond need regular blood transfusions with iron chelation. A stem cell transplant can cure the anemia, particularly with a matched sibling donor.

What is the life expectancy with Diamond-Blackfan anemia?

Many people with DBA live into adulthood with good care, and outcomes have improved with better transfusion, chelation and transplant practices. Life expectancy is affected by complications such as iron overload, treatment side effects and increased cancer risk, so lifelong follow-up is important.

Can Diamond-Blackfan anemia go into remission?

Yes. About 20% of patients enter remission, meaning their hemoglobin stays stable without steroids or transfusions. Remission can last for years but may not be permanent, so blood counts continue to be monitored.